Physics Quiz

What is the size of F?

• 6.0 N

• 60 N

• 12 N

• 30 N

Which object is the least stable?

• C

• B

• D

• A

What is the pressure exerted on the ground?

• 16 N/cm^2

• 40 N/cm^2

• 4.0 N/cm^2

• 160 N/cm^2

What is the expression for the change in pressure?

• 1/2 * V/V1 * p1 - p1

• 2/11 * V/V1 * p1 + p1

• p1 + 1/2 * V/V1 * p1

• 2/11 * V/V1 * p1 - p1

How much work is done by F in pulling the block up the slope?

• W × d

• W × l

• F × l

• F × h

What is the efficiency of the motor?

• 18%

• 22%

• 55%

• 82%

Electric motors have an efficiency of about 90% when used in an electric train. Which forms of wasted energy are produced?

• sound only

• thermal only

• thermal and chemical

• thermal and sound

What is a unit of power?

• J/s

• J/s

• N/s

• N s

Air is trapped in a metal cylinder by a piston. What happens to the mass of the air in the cylinder and its pressure as it cools?

• changes, does not change

• changes, changes

• does not change, changes

• does not change, does not change

Through which angle does the direction of the ray of light change?

• 90°

• 40°

• 100°

• 140°